Electric meter.



No. 695,143. Patented Mar. ll, I902.

T. BRUGER.

ELECTRIC METER.

(Application filed Nov. 29, 1901.)

(No Model.)

UNITED STATES PATENT OFFICE.

THEODOR BRUGER, OF FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR TO HARTMANN d: BRAUN, AOTIENGESELLSCHAFT, OF FRANKFORT-ON- TllE-MAlN, GERMANY, A FIRM.

ELECTRIC METER.

SPEOIFICATEON forming part of Letters Patent No. 695,143, dated March 11 1902.

Application filed November 29, 1901. Serial No. 84,075. (No model.)

To all wh m it may n r of the active coils the maximum is nearly Be it known that I, THEODOR .BRUGER, a reached.

subject of the Emperor of Germany, and a The mechanical arrangement of the armaresident of Frankfort-on-the-Main, Germany, ture is preferably so contrived that the com- (whose postal address is 9 Koenigstrasse, mon point in which the three resistance-coils 5 5 Frankfort-on-the-Main, Bockenheim,) have are united is at the upper end of the axis of invented certain new and useful Improverotation of the apparatus, the said upper end ments in Electric Meters, of which the followbeing there provided with a point of platiing is a specification. num, on which bears lightly a spring-plate,

I0 In electric meters the supply of the current through which the current enters the appato therotating armature presentsagreat diffiratus, Fig. 2. A connection similar to the culty, and owing to the unavoidable friction one hereinbefore described may also be proof the meter faulty indications are caused, vided on armatures having more than three especially when the load is light. The hereactive coils; but in this case it is necessary 15 inafter-described arrangement of the rotating that the rubbing contact should bearsimultaarmature for this class of meters renders it neously on several collector-segments. Thus possible to reduce the objectionable friction in case of four or live coils the rubbing con of the rubbing contacts, inasmuch as this artact would hear on two segments. rangement requires only one rubbing contact Having now particularly described and as 20 on the collector. certained the nature of my invention and in Figure 1 is a diagrammatic plan, and Fig. what manner the same is to be performed, I 2 a perspective view, illustrating the instrudeclare that what I claim isment according to this invention. 1. An electric meter,comprisinga plurality According to this invention the armature of conducting systems connected in parallel,

25 consists of three active coils a b 0, arranged each system including an active coil and a at one hundred and twenty degrees from each resistance connected by a collector-segment other, and of three resistances to 1/1 20 in arranged between the resistances and active advance of the active coils, there being one coils, the resistances being connected at a additional resistance to each coil. Between common point, with means for supplying cur- 0 each resistance and the coil is arranged the rent at said common pointof connection, subcorresponding collector segment, the three stantially as described. free ends of the coils being connected with 2. Anelectric meter, comprisingaplurality each other and those of the said resistances of conducting systems connected in parallel, being also connected with each other. The each system including an active coil and a 3 5 current arrives always at the common point resistance with a collector-segment between of connection of the three resistances, while the same to'which they are connected, said the current is taken by one of the three segresistances being connected at a common ments of the collector through a rubbing conpoint, with means for supplying current at tact. The active coils are so wound thattheir such point, and the active coils being con- 0 windings run in the same direction from the nected to each other, with means for withcollector, and they are traversed by the curdrawing current from the collector-segments, rent in such a manner that two of them are substantially as described. of the same polarity, while the third is of the In testimony whereof I have signed my opposite polarity. For a given current and name to this specification in the presence of 45 a given number of windings the active numtwo subscribing witnesses.

ber of ampere-turns increases as the resistance of the aforesaid resistance coils w 10 w TILLODOR LRUGER increases in proportion to that of the afore- Witnesses: said active coils a h 0. However, with resist- JEAN GEUND, 5o ance-coils which. are ten times the resistances CARL GEUND. 

